Question

Matrices help :)

Answer 1

For \(E\) to be the additive inverse of \(D\), you must have \(D+E=0\), where 0 is the zero matrix, not just the constant 0.

Answer 2

You'll get the zero matrix if every entry in \(D\) is the opposite of every corresponding entry in \(E\). So, \(E\) is the same as \(D\) EXCEPT that there's a minus sign in front of each entry.

Answer 3

Thanks!

Answer 4

yw